Improvement in steam-boiler furnaces



J. ENRIGHT.

STEAM-Boum FURNACE. No. 169,531. 'Patented N@'v`.z,1a'f5.

Ttnesses UNTTED STATES PATENT OFFICE.

JOSEPH ENEIGHT, OF sAN JOSE, CALIFORNIA.

IMPROVEMENT IN STEAM-BOILER FURNACES.

Specification forming part of Letters Patent No. 169,53 l, dated November 2, 1875 .application led July 23, 1875.

To all whom t may concern:

Be it known that I, JOSEPH ENEIGHT, of

, San Jos, Santa Clara county, State of Galiperson skilled in the art or science to which it most nearly appertains to make and use my said invention or improvement Without further invention or experiment.

My invention relates to certain improvements in the furnaces of steam-boilers, in which a large central flue is employed having a grate in its front end, and a combustionchamber behind with small 4return-fines.

My invention isl especially intended to iit the furnace for using straw as a fuel, and it contemplates the use of what I call a ringgrate behind the ordinary grate, so that I am ena-bled to do away with the extension mouthpiece, which is now attached to the furnacedoors for that purpose. My invention further consists in an adjusting-plate, by which I vary the size of the door-opening to tit the furnace for burning straw or wood; and, lastly, in the use of a cylindrical extension or shield containing a water hearth or floor, so that the loose straw is prevented from being blown about by the wind, and any cinders or burning straw which may drop will be extinguished by the water.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 is a longitudinal section of my boiler. Fig. 2 is a perspective view of the grates and door.

A is the shell of my boiler; B is the central due; Gis the combustion-chamber, and d d are the small return-lines. Within the large flue B are placed the grate-bars e, one end of which rests in depressions made for the purpose in the lower part of thehead F, which serves to close the front end of the due. The rear end of these grate-bars rests upon a bar or plate, which closes the lower part of the ue, and thus causes all the draft of air to pass up through the grate-bars.

In order to make my furnace capable of burning straw as a fuel, I have constructed whatIcall a ring-grate, Gr. This grate stands vertically in the tube B at the rear end of the horizontal grate, and it may be made in any suitable manner.

In the present case I have shown vertical grate-bars secured in or formed with a ring, which lits the interior of the tube. This ringgrate prevents the straw and cinders from being carried back into the combustion-chamber, and, as it may be desirable to remove this grate when wood is to be used as a fuel, I have shown a supporting-brace, H, which extends back into the Hue, and, resting upon the bottom, steadies the ring grate. The iront plate or head F may be secured by bolts through holes t' i in it, and by releasing these the head, grate-bars, and ring-grate can all be removed for cleaning or for other purposes. The door-opening J in the front F is 4closed by an ordinary door, K, and is made of a suficient size to admit of the use of wood when desired; but when I employ straw as a fuel I find it better to have a smaller opening, so as to prevent too much cold air entering. To regulate the size of this opening I fit a thin metal slide, L, to the front F, and this slide is slotted or guided so as to be moved down more or .less to close the opening. Being thin, it will in no way interfere with the closing of the door at any time. Upon a line with the bottom of the door-opening I make an extended hearth, M, which serves as a support for the wood or straw which is being introduced, and

also prevents the straw from falling among the' cinders.

In order to protect the door from the eii'ects of wind, which is liable to blow the light straw about. and also to prevent any burning straw from falling upon the ground, where it might 1. Inl a straw-burning furnace, the combination ot horizontal grate e e, and vertical grate G with the fire-box front, said parts being connected to be readily detached from the fire-box, substantially as shown and described.

2. In combination With the rin 112g-grate G, horizontal grate e, and front F of the flue C, the

adjustable slide L, for diminishing the dooropenin g independently of the door K,substan tially as and for the purpose herein described.

3. In combination with the ue C of a boiler, provided with the vertical and horizontal vgrates and door-opening, as shown, the cylindrical extension or shield N, substantially as and .for the purpose herein described.

4. The receptacle O, for receiving Water to form a Water-floor to the extension N, substantially as herein described.

5. The xed horizontal hearth N, upon a line with the bottom of the door-opening, to serve as a support and guide for the fuel, and to prevent the straw from falling among the cinders, substantially as herein described.

JOSEPH ENRIGHT.

Witnesses:

GEO. H. STRONG, C. M.- RICHARDSON. 

